Remove github corner from docs

docs/index.html

@@ -72,7 +72,6 @@
           crossChapter: true,
           crossChapterText: false
         },
-        repo: 'https://github.com/shoelace-style/shoelace/',
         routerMode: window.ShoelaceDevServer ? 'hash' : 'history',
         search: {
           maxAge: 86400000, // Expiration time, the default one day